The effect of the contraction of the muscles of the diaphram is that

A. he volume of the thoracic cavity increases.

B. more carbon dioxide is expelled through the nostrils

C. the rib cage is drawn inwards

D. the intercostal muscle becomes relaxed

Which of the following is an excretory product of Amoeba?

A. Urea

B. Ammonia

C. Uric acid

D. Amino acid

Which of the following processes occurs when the body temperature of a mammal rises above the normal?
I The arterioles in the skin dilate.
II Sweat production is reduced.
III The erector muscles contract.

A. I only

B. II only

C. I and III only

D. II and III only

The following functions are associated with the liver except

A. regulation of blood sugar

B. production of heat

C. production of fibrinogen

D. production of vitamin

Short-sight could be corrected with the use of

A. convex lens

B. cylindrical lens

C. concave lens

D. bifocal lens

Which of the following statements about the maize grain is not correct?

A. undergoes hypogeal germination

B. is a fruit

C. is non-endospermous

D. has pericarp fused with the testa

In mammals, fertilization usually occurs in the

A. cervix

B. vagina

C. uterus

D. oviduct

Which of the following vertebrates incubate their eggs?

A. Mammals

B. Birds

C. Amphibians

D. Reptiles

Which of the following is an agent of pollination of grasses?

A. Insects

B. Water

C. Wind

D. Mammals

The spinneret found in the caterpillar of butterfly is used for

A. protection against predators

B. feeding on vegetation

C. movement on twigs

D. production of silk thread